added pingpong scrolling

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@849 3ae390bd-cb1e-0410-b409-cd5a39f66f1f

diff --git a/widget_text.c b/widget_text.c
index 2bbb7aeeb50eb240f6905af752c6c983d8b3048b..dfcf6dd2b7f607383881a1cb537af2eb8f131ec7 100644 (file)
--- a/widget_text.c
+++ b/widget_text.c
@@ -5,6 +5,7 @@
  *
  * Copyright (C) 2003, 2004 Michael Reinelt <michael@reinelt.co.at>
  * Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
+ * Copyright (C) 2008 Michael Vogt <michu@neophob.com> 
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -95,6 +96,42 @@ void widget_text_scroll(void *Self)
        T->scroll++;
        if (T->scroll >= width + len)
            T->scroll = 0;
+       break;  
+    case ALIGN_PINGPONG:
+#define PINGPONGWAIT 2
+
+       /* scrolling is not necessary - center the string */
+       if (len <= width) {
+           pad = (width - len) / 2;
+       }
+       else {
+           if (T->direction == 1)
+               T->scroll++;            /* scroll right */
+           else
+               T->scroll--;            /* scroll left */
+               
+           /*pad = if positive, add leading space characters, else offset of string begin */   
+           pad = 0-T->scroll;
+           
+           if (pad < 0-(len-width)) {
+               if (T->delay-- < 1) {   /* wait before switch direction */
+                   T->direction = 0;   /* change scroll direction */
+                   T->delay = PINGPONGWAIT;
+                   T->scroll -= PINGPONGWAIT;
+               } /* else debug("wait1"); */
+               pad = 0-(len-width);
+           } 
+           else
+           if (pad > 0) {
+               if (T->delay-- < 1) {
+                   T->direction = 1;
+                   T->delay = PINGPONGWAIT;
+                   T->scroll += PINGPONGWAIT;
+               } /* else debug("wait2"); */
+               pad = 0;
+           }
+           
+       }
        break;
     default:                   /* not reached  */
        pad = 0;
@@ -219,12 +256,18 @@ void widget_text_update(void *Self)
 
     /* something has changed and should be updated */
     if (update) {
-       /* reset marquee counter if content has changed */
+       /* reset marquee counter if content has changed */      
        T->scroll = 0;
+       
+       /* Init pingpong scroller. start scrolling left (wrong way) to get a delay */
+       if (T->align == ALIGN_PINGPONG) {
+           T->direction = 0;   
+           T->delay = PINGPONGWAIT;
+       }
        /* if there's a marquee scroller active, it has its own */
        /* update callback timer, so we do nothing here; otherwise */
        /* we simply call this scroll callback directly */
-       if (T->align != ALIGN_MARQUEE || T->align != ALIGN_AUTOMATIC) {
+       if (T->align != ALIGN_MARQUEE || T->align != ALIGN_AUTOMATIC || T->align != ALIGN_PINGPONG) {
            widget_text_scroll(Self);
        }
     }
@@ -287,6 +330,9 @@ int widget_text_init(WIDGET * Self)
     case 'A':
        Text->align = ALIGN_AUTOMATIC;
        break;
+    case 'P':
+       Text->align = ALIGN_PINGPONG;
+       break;                                  
     default:
        error("widget %s has unknown alignment '%s', using 'Left'", section, c);
        Text->align = ALIGN_LEFT;
@@ -300,7 +346,7 @@ int widget_text_init(WIDGET * Self)
        Text->update = 10;
 
     /* marquee scroller speed: interval (msec), default 500msec */
-    if (Text->align == ALIGN_MARQUEE || Text->align == ALIGN_AUTOMATIC) {
+    if (Text->align == ALIGN_MARQUEE || Text->align == ALIGN_AUTOMATIC || Text->align == ALIGN_PINGPONG) {
        cfg_number(section, "speed", 500, 10, -1, &(Text->speed));
     }
 
@@ -314,7 +360,7 @@ int widget_text_init(WIDGET * Self)
     timer_add(widget_text_update, Self, Text->update, Text->update == 0);
 
     /* a marquee scroller has its own timer and callback */
-    if (Text->align == ALIGN_MARQUEE || Text->align == ALIGN_AUTOMATIC) {
+    if (Text->align == ALIGN_MARQUEE || Text->align == ALIGN_AUTOMATIC || Text->align == ALIGN_PINGPONG) {
        timer_add(widget_text_scroll, Self, Text->speed, 0);
     }
 

diff --git a/widget_text.h b/widget_text.h
index b3bd0a661c99b45f7eb415b123c3fadfbb1f6451..2ca6f30e8464a3c3ec6bf6cfd5e3d8165331a108 100644 (file)
--- a/widget_text.h
+++ b/widget_text.h
@@ -30,7 +30,7 @@
 
 #include "property.h"
 
-typedef enum { ALIGN_LEFT, ALIGN_CENTER, ALIGN_RIGHT, ALIGN_MARQUEE, ALIGN_AUTOMATIC } TEXT_ALIGN;
+typedef enum { ALIGN_LEFT, ALIGN_CENTER, ALIGN_RIGHT, ALIGN_MARQUEE, ALIGN_AUTOMATIC, ALIGN_PINGPONG } TEXT_ALIGN;
 
 typedef struct WIDGET_TEXT {
     PROPERTY prefix;           /* label on the left side */
@@ -45,6 +45,8 @@ typedef struct WIDGET_TEXT {
     int update;                        /* update interval */
     int scroll;                        /* marquee starting point */
     int speed;                 /* marquee scrolling speed */
+    int direction;             /* pingpong direction, 0=right, 1=left */
+    int delay;                 /* pingpong scrolling, wait before switch direction */
 } WIDGET_TEXT;